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GeneralAire 1042LH

Legacy Series 24V Bypass Humidifier with Manual Control

(2 Reviews)


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    • Pro Installation
Water is dispersed evenly throughout a Vapor Pad® inside the 1042LH. A portion of the heated air from the furnace passes through the water-soaked pad where it absorbs additional moisture and then returns for distribution throughout your home. Newly-moistened and healthier air is provided to you and your family.
  • For Home Sizes up to 2,800 Sq. Ft.
  • 19 GPD
  • 24V
  • Shut-Off Damper
  • 13 lbs.
  • Included:  MHX3 Manual-Control Duct Mount Humidistat.
  • Replacement Vapor Pad® number 990-13 (GFI #7002). Replace 1-2 times per season.
  • 5 Year Warranty.

Click Here to watch a video demonstrating how to change your Vapor Pad. 

Included in the GeneralAire 1042LH Box:
  • Humidifier
  • Humidistat
  • Installation Instructions
  • Vapor Pad®
  • Parts Kit
  • Drain Hose
  • Transformer
  • Metal Distributor Tube
  • Damper
  • 15’ 5/8” Drain Hose
  • Drain Pan
  • Solenoid Valve 

The two main types of standard humidifiers are the bypass and power fan.

Bypass humidifiers can be installed on either the supply or return plenum and you run a bypass duct to the plenum the unit isn't installed on.

Power-Fan humidifiers can be installed on a vertical run of either the supply or return plenum and uses a fan to distribute humidity into the air stream.

Maximum Coverage Area

Maximum coverage area means this humidifier will perform well for home sizes up to the square footage indicated, provided that the home is “tight." A "tight" home is typically one that is sealed well around windows and doors and does not leak air to/from the outdoors.

Maximum Coverage Area
2800 Square Feet
Water Capacity (GPD)

The amount of water vapor that can be delivered into the home, measured in gallons per day (GPD), that the humidifier can deliver into the space.

Water Capacity (GPD)
19 Gallons/Day
Electrical Requirements

The electrical requirements either 24 volts (bypass humidifiers) or 120 volts (power fan humidifiers) that needs to be supplied to the unit.

Electrical Requirements
24 Volts
Bypass Duct Diameter
6 inches
Plenum Opening Size
10 1/4W x 9 1/2H inches
15 Inches
11 1/2 Inches
Limited Warranty
5 Years